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26 Aug 1977 Jahr - zinc-air battery

Beschreibung:

A mercury free battery introduced to have a greater capacity when it come to volume since the amount of mercury has depleted. Was a major part of the incoming technology of hearing aids with much credibility.

Zugefügt zum Band der Zeit:

Deaf Technology 1960s-2017

ByBlanche Padecio
13 Dez 2017
0
0
538

Datum:

26 Aug 1977 Jahr
Jetzt
~ 48 years ago
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